The temperature on April 11, 1911 was between 0.6 °C and 11.7 °C and averaged 6.0 °C. There was 0.1 mm of rain. There was 9.1 hours of sunshine (67%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the northeast. Source: KNMI
April 29 » Tsinghua University, one of mainland China's leading universities, is founded.
May 31 » The President of Mexico Porfirio Díaz flees the country during the Mexican Revolution.
August 29 » Ishi, considered the last Native American to make contact with European Americans, emerges from the wilderness of northeastern California.
September 20 » The White Star Line's RMSOlympic collides with the British warship HMSHawke.
September 24 » His Majesty's Airship No. 1, Britain's first rigid airship, is wrecked by strong winds before her maiden flight at Barrow-in-Furness.
October 24 » Orville Wright remains in the air nine minutes and 45 seconds in a glider at Kill Devil Hills, North Carolina.
Day of marriage April 16, 1932
The temperature on April 16, 1932 was between 4.8 °C and 7.4 °C and averaged 6.1 °C. There was 0.5 mm of rain during 1.1 hours. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the east-northeast. Source: KNMI
In The Netherlands , there was from August 10, 1929 to May 26, 1933 the cabinet Ruys de Beerenbrouck III, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
January 1 » The United States Post Office Department issues a set of 12 stamps commemorating the 200th anniversary of George Washington's birth.
June 24 » A bloodless revolution instigated by the People's Party ends the absolute power of King Prajadhipok of Siam (now Thailand).
July 20 » In the Preußenschlag, German President Hindenburg places Prussia directly under the rule of the national government.
July 29 » Great Depression: In Washington, D.C., troops disperse the last of the "Bonus Army" of World War I veterans.
September 23 » The unification of Saudi Arabia is completed.
November 24 » In Washington, D.C., the FBI Scientific Crime Detection Laboratory (better known as the FBI Crime Lab) officially opens.
Day of death September 25, 1960
The temperature on September 25, 1960 was between 8.1 °C and 18.8 °C and averaged 13.1 °C. There was 0.1 mm of rain. There was 8.3 hours of sunshine (69%). The partly clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the north-northeast. Source: KNMI
April 25 » The United States Navy submarine USSTriton completes the first submerged circumnavigation of the globe.
July 28 » The German Volkswagen Act came into force.
August 12 » Echo 1A, NASA's first successful communications satellite, is launched.
November 4 » At the Kasakela Chimpanzee Community in Tanzania, Dr. Jane Goodall observes chimpanzees creating tools, the first-ever observation in non-human animals.
November 28 » Mauritania becomes independent of France.
December 15 » Richard Pavlick is arrested for plotting to assassinate U.S. President-Elect John F. Kennedy.
When copying data from this family tree, please include a reference to the origin: Hermannus Wulff, "Family tree Wolf-Wulff", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-wolf-wulff/I451.php : accessed January 24, 2026), "Maria (Marie) Van Der Munnik (1911-1960)".
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